Comment on 'Frustrated Octahedral Tilting Distortion in the Incommensurately Modulated Li_(3-x)Nd_(2/3-x)TiO3 Perovskites'

摘要

A. M. Abakumov et al. have recently published an article entitled "Frustrated Octahedral Tilting Distortion in the Incommensurately Modulated Li_(3-x)Nd_(2/3-x)TiO3 Perovskites" (Chem. Mater. 2013, 25, 2670). This work provides new insights into the understanding of the origin of the crystal structure modulation of these perovskite-type oxides. The author's picture of incommensurate octahedral tilting is an impressive piece of work and ah important piece of the puzzle, one that advances our understanding of these complex structures. However, there is no reason why a composition modulation cannot also accompany the modulation in octahedral tilting in the AA'BB'O6 compounds that we have studied. In fact, the data that have been published lend strong support for that conclusion.